Backup/Restore

One of the most important concepts in computer security is that of backup. This is especially true regarding Internet safety, as the Internet can be the source of so many threats to your data
The idea of backing up is to make a copy of your important data as a precaution against losing the original.
Many home users will make backups of important files to CDs or even DVDs whereas business users will typically have a more robust backup/restore strategy with expensive hardware and software, eg: magnetic tapes or removable disk drives.
Some operating systems have the facility to take a dated snapshot of a fully working system. This snapshot can be used to restore the system back to this snapshot if something goes wrong later. This snapshot is called a restore point.